Is there a way in json-schema to validate object keys matching regex?

Question

Is there a way to have the json schema validator to validate keys of a json object? For example:

{
    "$schema": "http://json-schema.org/draft-07/schema",
    "type": "object",
    "properties": { // here properties is an object containing user-defined keys that should be alphanumeric or underscore.
        "values": {
            "type": "object",
            "patternProperties": {
                "[a-zA-Z0-9_]+": {
                    "description": "Foo"
                }
            }
        }
    }
}

So here's some examples of what should and shouldn't pass:

// Should pass:
{
 "values": {
   "myKey1": { "foo": 1 },
   "myKey2_": "bar"
 }
}

// Should fail but no error is shown saying this doesnt match schema:
{
  "values": {
    "m\1[]": 123
  }
}

I tried using patternProperties but anything that doesn't match my regex is just ignored, no validation error is thrown on the offending line. This is consistent with documentation on patternProperties: https://json-schema.org/understanding-json-schema/reference/object.html#pattern-properties

Is there a way to do what i'm looking for? Thanks

Answer 1

You should be able to use additionalProperties to make an object invalid that doesn't pass the patternProperties you've required.

By default any additional properties are allowed.

{
"$schema": "http://json-schema.org/draft-07/schema",
"type": "object",
"properties": {
    "values": {
        "type": "object",
        "patternProperties": {
            "[a-zA-Z0-9_]+": {
                "description": "Foo"
            },
            "additionalProperties": false
            }
        }
    }
}

↳ JSON Schema : Additional Properties